Malicious PDF — malware analysis report

Static analysis result for SHA-256 878a697236af438d…

MALICIOUS

PDF

46.7 KB Created: 2020-08-17 11:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3c34f0cd0f19635ad08881d09277511 SHA-1: 28f84f42f88d5c4226dd3451902df97ed87cc3c1 SHA-256: 878a697236af438de78a575a0983be3dcda2c6027b3f107788772c47d44a89d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=finance+committee+meeting+agenda+template'. The document body, though heavily obfuscated, contains this URL and other links, indicating an attempt to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=finance+committee+meeting+agenda+template
    • http://zosigi.delmarinelloart.com/uploads/1/3/1/3/131383694/tikajomipen_julikubu_logebi.pdf
    • http://files.faithfamilymaui.com/uploads/1/3/1/6/131607027/mudokom.pdf
    • http://lavudo.vlavc.com/uploads/1/3/1/4/131453284/vezesumulanomaxur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4485/4165/files/foriga.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/pabewudiribowupig.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/cambridge_primary_english_learner_s_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/0171/5622/files/storey_building_plans.pdf
    • https://cdn.shopify.com/s/files/1/0431/2124/6359/files/hackers_game_redux_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/3846/5435/files/english_test_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0433/8833/8330/files/jubilezaninunuwumaw.pdf
    • https://cdn.shopify.com/s/files/1/0438/8257/8088/files/zisevuxudosi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3993/8970/files/spelling_bee_words_for_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/wevok.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/70256142658.pdf
    • https://cdn.shopify.com/s/files/1/0429/2008/3612/files/53346558486.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007935.bin
8d2ab41268004c8730b7c6b3770533ac397fa94c7502e40d0265f45bef0de4aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7935 5072 bytes
font_01_sfnt_off00008a5d.bin
121ca4f12dd79ee0b68baa492abc790897a9010a66df74eb6b67949635c642c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5D 10296 bytes

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